Steam-engine



(No Model.)

J. MOORE STEAM ENGINE.

No. 439,750. Patented Nov. 4, 1890.

5o stuffing-box 5 being provided, as usual,

UNITED STATES PATENT OFFICE.

JOSEPH H. MOORE, OF ALTOONA, PENNSYLVANIA.

STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 439,750, dated November 4, 1890. Application filed August 14, 1890. Serial No. 361,962. (No model.)

To all whom it may concern:

Be it known that I, JOSEPH H. MOORE, a resident of Altoona, in the county of Blair and State of Pennsylvania, haveinvented certain new and useful Improvements in Steam- Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in steam-engines, and more particularly to that variety in which the same steam is applied successively on the different heads of the pistons before it is finally exhausted, to the end that its full power is utilized before it is discharged from the engine, and the amount of steam required to actuate the engine is reduced to a minimum, resulting incidentally in a great saving in the expense of running the engine. I

With this object in view my invention consists in a large and small cylinder and pistons fitted in said cylinders, in connection with steam-ports leading to the opposite sides of the pistons into a common valve-chest, and a single valve fitted in the valve-chest and provided with ducts adapted to register with the steam-ports in such a manner that the live steam is conducted successively to the different sides of the pistons and finally exhausted, whereby the full expansible power of the steam is used before it is finally discharged; and it consists in certain novel features of construction and combinations of parts, as will be hereinafter described, and pointed out in the claims.

lhe accompanying drawing is a longitudinal sectional view of my improved engine and valve.

A A represent a large and small cylinder, and B and B are piston-heads fitted in these cylinders, respectively, the two being c0nneeted together concentrically, as illustrated. Piston-rod 1 has a hinged connection with these pistons at point 2, and around the portion of the rod which passes into the cylinder a cylindrical shell or casing 4: is formed, the same being against the wall of the engine, a

to prevent the escape of steam.

O is the valve-chest, and D is a valve fitted to reciprocate therein after the usual manner. It will be observed in this connection that a single valve is employed and that all the steam-ports are controlled by it, the advantage of one valve over two or more being to reduce expense and friction, and,furthermore, to make the course of the steam more direct and less circuitous, so that as little of its elasticity and force as possible is lost. This valve is provided with two steam-ducts 7 and 8, adapted to register with ports 6, 9, and 10 and exhaust 11 of the engine at various intervals, as will be hereinafter alluded to, in order to insure the effectual operation of the engine.

In operation steam enters the valve-chest through pipe 5, moving the valve past the port 6, so that the steam enters the latter and by its impact against piston-head B forces the piston forward. At the same time the steam from the opposite face of piston B passes out through port 10 and duct 8 in the valve, and thence through port 9 against the other side of piston B. When the pistons have reached their extreme throw in this direction, the valve is slid in the opposite direction, and the steam from one side of piston B passes out through port 9, through duct 8 in the valve, and into the exhaust. At the same time steam from the corresponding side of piston Bpasses through port 6, duct 7, into port 10, and on the opposite side of piston B, thus forcing the pistons back again to the position shown in the illustration. Steam now forces the valve forward again, and the same operation continues.

It is evident that slight changes might be resorted to in the form and construction of the several parts described without departing from the spirit and scope of my invention, and hence I do not Wish to limit myself to the exact construction herein set forth; but,

Having fully described my invention, What I claim as new, and desire to secure by Letters Patent, is-

1. The combination, With a large and small cylinder and corresponding-sized pistons fitted in these cylinders respectively, of ports leading to both sides of the pistons from a common valve-chest, and a valve fitted in the latter and having ducts adapted to register with the steam-ports in such a manner that the same steam is directed successively to the different surfaces of the pistons, substantially as set forth.

2. The combination, with a large and small cylinder and ports leading to each side of the large piston and one side of the small one, of v a valve having ducts therein which direct the steam back and forthfrom one piston-headto [O the opposite side of the other and from one head to the exhaust with each full stroke of the engine, substantially as set forth.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

JOSEPH H. MOORE.

\Vitnesses:

C. O. MCCORMICK, J ULE. A. NEFF. 

